Merge bitcoin/bitcoin#24213: refactor: use Span in random.*

3ae7791bca refactor: use Span in random.* (pasta)

Pull request description:

  ~This PR does two things~
  1. use a Span<unsigned char> for GetRandBytes and GetStrongRandBytes

  ~2. make GetRand a template for which any integral type can be used, where the default behavior is to return a random integral up to the max of the integral unless a max is provided.
  This simplifies a lot of code from `GetRand(std::numeric_limits<uint64_t>::max()` -> `GetRand<uint64_t>()`~

  MarcoFalke this was inspired by your comment here: https://github.com/bitcoin/bitcoin/pull/24185#issuecomment-1025514263 about using Span, so hopefully I'll be able to get this PR done and merged 😂

  ~Also, if requested I could revert the `GetRand(std::numeric_limits<uint64_t>::max()` -> `GetRand<uint64_t>()` related changes if it ends up causing too many conflicts~

ACKs for top commit:
  laanwj:
    Thank you! Code review re-ACK 3ae7791bca

Tree-SHA512: 12375a83b68b288916ba0de81cfcab4aac14389a66a36811ae850427435eb67dd55e47df9ac3ec47db4e214f4330139e548bec815fff8a3f571484ea558dca79

src/net_processing.cpp

@@ -4472,7 +4472,7 @@ void PeerManagerImpl::MaybeSendPing(CNode& node_to, Peer& peer, std::chrono::mic
     if (pingSend) {
         uint64_t nonce = 0;
         while (nonce == 0) {
-            GetRandBytes((unsigned char*)&nonce, sizeof(nonce));
+            GetRandBytes({(unsigned char*)&nonce, sizeof(nonce)});
         }
         peer.m_ping_queued = false;
         peer.m_ping_start = now;